Mechanical behaviour and functional properties of porous Ti-45 at. % Ni alloy produced by self-propagating high-temperature synthesis

Resnina, Natalia; Belyaev, Sergey; Voronkov, Andrey; Gracheva, A. P.

doi:10.1088/0964-1726/25/5/055018

Cited by 10 publications

(6 citation statements)

References 44 publications

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“…Comparison of the experimental results with the literature data confirms the fact that porous alloys obtained by the SHS method have stiffness, strength and plasticity values under compression that are not lower than the values obtained by other authors [1,[20][21][22][23][24][25][26] on titanium-containing materials, obtained by other methods. In [1], Ti6Al4V-based alloys have porosity ranging within 60-85% with pore sizes starting from 250 μm in case of the elastic modulus variation from 0.5 to 3 GPa.…”

Section: Results Of Quasi-static Uniaxial Compression Of the Porous T...supporting

confidence: 82%

Anisotropy of elastic properties of SHS-synthesized porous titanium nickelide

Kozulin¹,

Vetrova²,

Yasenchuk³

et al. 2022

nfm

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Samples of porous NiTi were obtained by the method of self-propagating high-temperature synthesis. The mechanical characteristics of the porous ones were studied by quasi-static compression. When the samples of porous titanium nickelide were subject to quasi-static compression, the deformation was of an elastic-plastic nature. Three characteristic types of the fracture surface under quasi-static compression of the porous SHS -TiNi alloy were identified: 1) ductile fracture of the austenite phase in the form of a cup relief, 2) brittle fracture accompanied by the formation of cleavage steps, 3) large areas of plastic shear deformation, on which cups and cleavage facets were nucleated. To determine the anisotropy of the porous TiNi alloy properties, the volume of the porous sample was simulated, and estimated calculations were carried out. Based on the results of reconstructing 3D neutron high resolution tomography of the porous volume of titanium nickelide and the numerical parameters of the model porous medium, an algorithm was developed for obtaining a solid-state 3D model of the porous framework for using in finite element calculations. The studied porous titanium nickelide alloy, as well as spongy bone tissues, was shown to have orthotropic elastic properties conditioned by the geometric features of the porous framework. The effective moduli of elasticity and shear for the porous volume of the material were determined. The calculation results of the elastic moduli for the studied model of porous titanium nickelide numerically agree with the results obtained by compressing the samples of porous TiNi. The porous TiNi alloy under uniaxial compression was established to be destroyed under the action of tangential shear stresses at an angle of 45 degrees to the direction of uniaxial compression.

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Section: Results Of Quasi-static Uniaxial Compression Of the Porous T...supporting

confidence: 82%

Anisotropy of elastic properties of SHS-synthesized porous titanium nickelide

Kozulin¹,

Vetrova²,

Yasenchuk³

et al. 2022

nfm

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“…3 b. The curve indicated by the dashed line illustrates the experimental data [17], the solid line corresponds to the numerical results. The non-linear character of the theoretical curves is due to the non-simultaneous start of different deformation mechanisms in beams with different dimensions.…”

Section: Resultsmentioning

confidence: 95%

“…3 a shows the simulated stress-strain diagrams of isothermal compression up to 350 MPa with intermediate unloadings of the samples with a porosity of 60 % in the martensitic state at temperatures 25, 45, and 65°C. The dashed lines indicate the experimental curves [17]. The stress-strain diagrams for porous TiNi sample under compression in the austenitic state at temperature 160°C is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Model for simulation of the mechanical behavior of a porous shape memory alloy with a non-ordered structure

2020

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A model for simulation of the mechanical properties of porous NiTi shape memory alloy samples (SMA) with high through porosity has been proposed. Such samples are obtained from nickel and titanium powders by self-propagating hightemperature synthesis under specially selected technological conditions. The structure of the samples corresponds to a set of ligaments without a clearly defined orientation of the pore channels. In this work, a study of microphotographs of porous NiTi samples with a porosity of 60 % has been carried out. Basing on this study such a porous material has been approximated by a beam structure consisting of horizontal beams supported by vertical curved beams. A specially developed technique of finding the geometric parameters of this beam structure was used for its characterization. The object for modeling determined in this way provides the opportunity to take into account the basic structural features of the sample. The strain of the porous sample is then calculated with the use of the methods of the strength of materials by calculating the displacements of all structural elements. The constitutive relations of the SMA microstructural model have been used to describe the SMA deformation. This model proved to be an efficient tool for simulation of the functional and mechanical behavior of a solid SMA under various thermal and mechanical loadings. The deformation curves of porous NiTi under compression at different temperatures corresponding to the martensitic and to the austenitic state of the SMA have been calculated. The results of the simulation have shown good agreement with the experimental data.

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“…Numerous studies investigated the deformation behavior of porous TiNi compounds for the past ten years [29,63,69,70]. Most have reported that the task is fascinating and actual, but still challenging.…”

Section: Characteristics Of Porous Shs Tinimentioning

confidence: 99%

Biocompatibility and Clinical Application of Porous TiNi Alloys Made by Self-Propagating High-Temperature Synthesis (SHS)

Yasenchuk¹,

Марченко²,

Gunther³

et al. 2019

Materials

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Porous TiNi alloys fabricated by self-propagating high-temperature synthesis (SHS) are biomaterials designed for medical application in substituting tissue lesions and they were clinically deployed more than 30 years ago. The SHS process, as a very fast and economically justified route of powder metallurgy, has distinctive features which impart special attributes to the resultant implant, facilitating its integration in terms of bio-mechanical/chemical compatibility. On the phenomenological level, the fact of high biocompatibility of porous SHS TiNi (PTN) material in vivo has been recognized and is not in dispute presently, but the rationale is somewhat disputable. The features of the SHS TiNi process led to a multifarious intermetallic Ti4Ni2(O,N,C)-based constituents in the amorphous-nanocrystalline superficial layer which entirely conceals the matrix and enhances the corrosion resistance of the unwrought alloy. In the current article, we briefly explore issues of the high biocompatibility level on which additional studies could be carried out, as well as recent progress and key fields of clinical application, yet allowing innovative solutions.

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Mechanical behaviour and functional properties of porous Ti-45 at. % Ni alloy produced by self-propagating high-temperature synthesis

Cited by 10 publications

References 44 publications

Anisotropy of elastic properties of SHS-synthesized porous titanium nickelide

Anisotropy of elastic properties of SHS-synthesized porous titanium nickelide

Model for simulation of the mechanical behavior of a porous shape memory alloy with a non-ordered structure

Biocompatibility and Clinical Application of Porous TiNi Alloys Made by Self-Propagating High-Temperature Synthesis (SHS)

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